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Testing potential transformers (April 1914)

Author: Brooks, H.B.
Volume: Bulletin of the Bureau of Standards, Vol. 10, 419-424 (1914) Scientific Paper 217 (S217)
Subject: transformers, rotary converters and boosters; measurements and use of instruments/ B8300 Power apparatus and electric machines
Publisher: National Bureau of Standards
Possible copyright status: The Bulletin of the Bureau of Standards is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder.
Language: English
Digitizing sponsor: NIST Research Library
Book contributor: NIST Research Library
Collection: NBSBulletin; NISTresearchlibrary; fedlink; americana


A method of testing instrument transformers by means of ordinary commercial testing instruments is described. It has to be remembered that from the practical point of view we need only take account of these errors in ratio or phase angle which produce a visible error in the reading of the indicating wattmeter. A wattmeter is taken and used in such a way that differences in ratio or phase angle of the transformer being tested and a standard transformer may be most readily detected. The method is very similar to that described by C. V. Drysdale. The experimental results given prove the accuracy of the method.

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